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The flask was then shaken until the solution was uniform. A 45.0-rm mL sample of this glucose solution was diluted to 0.500 rm L. How many grams of glucose are in 100. rm mL of the final solution?
If the volumes in the buret and the flask are identical and the concentration of the acid in the buret is 0.250 M, what is the concentration of the base in the flask?
What mass of this substance must evaporate in order to freeze 190 of water initially at 24? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
Predict the physical state of ammonia at -50 degrees C (Mp=-77 degrees C, Bp=-33 degrees C) and normal atmospheric pressure
The enthalpy of fusion of methanol is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol.
A gas is placed in a storage tank @ a pressure of 30.0 atm @ 20.3oc as a safety device there is a small metal plug in the tank of a metal alloy that melts @ 130oC.
Metallic Magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas. If 16.2 g of Mg are heated with 12.0 g of H2O, what is the limiting reactant? How many moles of the excess react
Compute the density in g/cm^3 of piece metal that has a mass of 0.400kg and a volume of 73cm^3. How to work this problem out and get the answer?
It was found that 19.31 mL of an HCl solution are needed to react completely with 322 mL of a LiOH solution that has a pH of 11.56. What is the molarity of the HCl solution?
How much energy (in kilojoules) is required to convert 205 of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 ? if heat of vaporazation is 26.5
A volume of 80.0 ml of H2O is initially at room temperature (22.0 C). A chilled steel rod at 2.00 C is placed in the water. If the final temperature of the system is 21.1 C , what is the mass of the
What is the freezing point of a solution of ethylene glycol (antifreeze), a nonelectrolyte, that contains 140. g of C2H6O2 dissolved in 290. g of water? Use molar masses with at least as many signific
A volume of 125 mL of rm H_2O is initially at room temperature (22.0rm{}~^{circ}C). A chilled steel rod at 2.00rm~^{circ}C is placed in the water. If the final temperature of the system is 21.4~^{c
The experimenter now finds that the vessel and its contents weigh 10.5 g more than the vessel full of ethanol only. The density of ethanol is 0.789 g/cm3. What is the density of the object?
What products would you expect to obtain in the reaction of alpha-naphthaldehyde with KOH? Write a detailed reaction mechanism (including lone pairs and arrows to show electron flow).
Suppose you plan to make up the specified aqueous solution of sodium acetate after you combine acetic anhydride with the aqueous solution of aniline. Why is this not an appropriate strategy? Explain y
According to the following reaction, how many moles of calcium oxide will be formed upon the complete reaction of 29.3 grams of calcium carbonate?
The Balmer series of transitions for the hydrogen atom result in absorption of photons that all originate from the n = 2 level. What are the longest and shortest wavelength photons in the Balmer se
A 100.0-g sample of water at 27.0 oC is poured into a 75.0-g sample of water at 89.0 oC. What will be the final temperature of the water?
When 1.6768 g of an organic iron compound containing, Fe, C, H and O was burned in O2, 3.1363 g of CO2 and 0.89758 g of H2O were produced. What is the mass percent of hydrogen in the compound?
The second-order reaction, 2 Mn(CO)5 Mn2(CO)10 has a rate constant equal to 3.0 x 109 M-1s-1 at 25°C. If the initial concentration of Mn(CO)5 is 1.0 x 10-5 M, how long will it take for 90.% of t
A compound with the empirical formula CH2O was found to have a molar mass between 89 and 91 g. What is the molecular formula of the compound?
On a recent autumn day, the consentration of carbon monoxide in the air in downtown Denver Co. What is the concentration of CO in molecules per cubic meter?
A physician wrote a prescription for Tylenol® 325 mg/5 mL with codeine 10 mg/5 mL liquid, 5 mL three times a day x 4 days as needed for cough
If you were to prepare a 1.00 solution of beginning with water at 27.5, what would the final temperature of the solution be (in )? Assume that the specific heats of both pure and the solution are t